Display screen or portion thereof with transitional icon



FIG. 1 is a front view of the first image in a sequence of a display screen or portion thereof with transitional icon showing our new design;

FIG. 2 is a front view of the second image in a sequence thereof;

FIG. 3 is a front view of the third image in a sequence thereof;

FIG. 4 is a front view of the fourth image in a sequence thereof;

FIG. 5 is an enlarged view of the first image in a sequence as shown in FIG. 1;

FIG. 6 is an enlarged view of the second image in a sequence as shown in FIG. 2;

FIG. 7 is an enlarged view of the third image in a sequence as shown in FIG. 3; and,

FIG. 8 is an enlarged view of the fourth image in a sequence as shown in FIG. 4.

The broken lines in the figures depict environmental subject matter and form no part of the claimed design. The outermost broken lines in the figures represent a display screen or portion thereof and form no part of the claimed design.

The appearance of the transitional icon sequentially transitions between the images shown in FIGS. 1-4 and in FIGS. 5-8. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen or portion thereof with transitional icon, as shown and described. 